61117872 has 20 divisors (see below), whose sum is σ = 157887960. Its totient is φ = 20372608.

The previous prime is 61117811. The next prime is 61117879. The reversal of 61117872 is 27871116.

It is not an unprimeable number, because it can be changed into a prime (61117879) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 636597 + ... + 636692.

It is an arithmetic number, because the mean of its divisors is an integer number (7894398).

Almost surely, 2^61117872 is an apocalyptic number.

It is an amenable number.

61117872 is an abundant number, since it is smaller than the sum of its proper divisors (96770088).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61117872 is a wasteful number, since it uses less digits than its factorization.

61117872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1273300 (or 1273294 counting only the distinct ones).

The product of its digits is 4704, while the sum is 33.

The square root of 61117872 is about 7817.7920156525. The cubic root of 61117872 is about 393.9031086096.

Adding to 61117872 its reverse (27871116), we get a palindrome (88988988).

Subtracting from 61117872 its reverse (27871116), we obtain a square (33246756 = 5766²).

The spelling of 61117872 in words is "sixty-one million, one hundred seventeen thousand, eight hundred seventy-two".